Hi Guy,
You are fast! I think this is the answer! I overlooked of this.
Thanks!
Jonathan.
----- Original Message -----
From: "Guy Davies" <Guy.Davies@telindus.co.uk>
To: "'Jonathan Tse'" <jonathantse@pacific.net.sg>;
<juniper-nsp@puck.nether.net>
Sent: Friday, November 09, 2001 1:25 AM
Subject: RE: [j-nsp] [j-nsp] strange ATM speed
>
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> Hi Jonathan,
>
> It looks like the switch is counting the ATM headers in the 50Mbps
> and the Juniper is not (it's documented that Juniper calculates the
> bps as 384 x cps - 384 = 48 x 8). This means that the Junper, if
> configured to send 50,000,000bps, will actually send
>
> 50,000,000/48 * 53 bps = 55208334bps
>
> This kind of matches what you saw.
>
> Regards,
>
> Guy
>
> > -----Original Message-----
> > From: Jonathan Tse [mailto:jonathantse@pacific.net.sg]
> > Sent: Thursday, November 08, 2001 5:18 PM
> > To: juniper-nsp@puck.nether.net
> > Subject: [j-nsp] [j-nsp] strange ATM speed
> >
> >
> > Hi all,
> >
> > I am experiencing a strange ATM problem. A 50Mbps CBR pipe is
> > configured at
> > a M5, which runs Junos 5.0r2, and connects to an ATM switch.
> > If I enable
> > traffic shaping at ATM switch, 50Mbps CBR as well, it reports
> > there is large
> > number of cell drop. We have tried the same setting at
> > another M5 which is
> > running Junos 4.4r1.5 plus the ATM switch but there is no cell
> > drop!
> >
> > Additionally, if I lower the cbr speed to 45Mbps at router
> > end -OR- increase
> > the cbr speed at ATM switch to 56Mbps, no cell drop again!
> >
> > I don't think it is the fiber problem as the router & switch
> > are just next
> > to each other and no LOS, LOF, etc...
> >
> > Any comment? What troubleshooting I should do next? Thanks!
> >
> > at-0/1/0 {
> > atm-options {
> > vpi 2 maximum-vcs 120;
> > }
> > unit 0 {
> > encapsulation atm-snap;
> > vci 2.101;
> > shaping {
> > cbr 45m;
> > }
> > oam-period 10;
> > family inet {
> > .....
> > }
> > }
> > }
> >
> > regards,
> > Jonathan Tse,
> > network engineer, Pacific Internet Singapore,
> > NOC: 65-8721010, DID: 65-7710843, FAX: 65-8726674
> >
>
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